One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(5,6)(7,11)(8,12)(9,10)(13,14)(15,17)(16,18)(19,23)(20,24)(21,25)(22,28)(26,27)(6,10)(11,12)(13,15,18,25,20,26,19,22)(14,21,23,17,24,28,16,27)(5,7,9,8)(6,11,10,12)(13,16,19,24,20,23,18,14)(15,21,22,27,26,28,25,17)(1,3,4,2)(5,8,9,7)(6,11,10,12)(13,17,18,28,20,27,19,21)(14,22,23,15,24,25,16,26)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.